Re: UEFI support in ARM DomUs

[Stefano Stabellini <sstabellini@xxxxxxxxxx>]

+ George

On Sun, 31 May 2020, Roman Shaposhnik wrote:
> Hi Julien!
> 
> On Sun, May 31, 2020 at 3:24 PM Julien Grall <julien.grall.oss@xxxxxxxxx> 
> wrote:
> >
> > On Sun, 31 May 2020 at 23:05, Roman Shaposhnik <roman@xxxxxxxxxx> wrote:
> > > Hi!
> > >
> > > with a lot of help from Stefano, we're getting RPi4 support in
> > > Project EVE pretty much on par between KVM and Xen.
> > >
> > > One big area that still remains is supporting UEFI boot sequence
> > > for DomUs. With KVM, given the qemu virt device model this is
> > > as simple as using either stock UEFI build for arm or even U-Boot
> > > EFI emulation environment and passing it via -bios option.
> > >
> > > Obviously with Xen on ARM we don't have the device model so
> > > my understanding is that the easiest way we can support it would
> > > be to port UEFI's OvmfPkg/OvmfXen target to ARM (it seems to
> > > be currently exclusively X64).
> >
> > EDK2 has been supporting Xen on Arm for the past 5 years. We don't use
> > OvmfPkg/OvmfXen but ArmVirtPkg/ArmVirtXen (see [1]).
> > I haven't tried to build it recently, but I should be able to help if
> > there is any issue with it.
> >
> > Cheers,
> >
> > [1] https://github.com/tianocore/edk2/blob/master/ArmVirtPkg/ArmVirtXen.fdf
> 
> This is really, really awesome -- I guess it would be really helpful to 
> document
> this someplace on the ARM/Xen wiki (I can volunteer if someone can grant
> me the karma).

Regarding the wiki: yes please! Let George know if you don't have write access.


> I've built XEN_EFI.fd and the rest worked out like a charm.
> 
> All on Raspberry Pi 4!

Fantastic!